On the Effects of Root Diffusates From Tagetes Spp. On Heterodera Rostochiensis Woll

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The hatching stimulus or nematicidal effect of Tagetes root diffusates on potato-root eelworm was investigated. Root diffusates of potato, tomato and Solanum melongena were also used. Plain water was used as a control. Neither hatching power nor nematicidal effects were detected from three species of Tagetes root diffusates. Analysis of covariance suggests that the biological differences between active root diffusates from different sources are most clearly revealed when counts of emerged larvae are expressed in terms of the weight of oven-dried roots. S. melongena root diffusate showed a weaker stimulatory power than those of potato and tomato.